If you can please zip and email us at support at logsat.com your SpamFilter's activity file for the day the above email was received, we'll try to see what's going on. The "250 OK" at the end usually indicates the email was received successfully by SpamFilter and should be forwarded to your mail server, however the "send to NULL" or "NO NDR" options that can be enabled (they are always off by default) do cause spam emails to be received and then dropped immediately, without providing indication to the sender that they were not delivered (that behavior is discouraged, which is why the options to do so are disabled by default).
If the file is over 5MB I will send you a PM with our FTP upload login info.

In regards to the backup server question, please see our reply to a similar forum question earlier today:
http://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=6575#12466

Actually the email was not stopped at all, the message you see, "Whitelisted - Email size exceeded MaxMsgSizeForSpamFiltering", simply means that, since the email is over a certain minimum threshold size, most likely it is *not* spam, and thus it is being whitelisted for content and delivered.

The email is received successfully, and then SpamFilter asttempts to deliver it to your mail server. This is seen in the line:

If you are not receiving it, it's possible that your mail server rejected it for some reason. You can verify by continuing looking at log entries below the above one, the relevant ones will have the ID (2568) in them, and will show if the forwarding attempt to your mail server was successful or resulted in an error.

In regards to the FTP, please note that the site is protected in that it allows you to upload files, but not download them. If you try to upload using Internet Explorer for example, rather than an real FTp client, your IE may cause an error as it will not be able to read the directory listing. If you can try to upload the file again using a regular FTp client (or command line) it should work.

while moving the server running spamfilterISP to another datacenter mail was rerouted thru another server, this server was configured to drop mail over 2MB and therefor mail never arived at my exchange server.

In the time we tested spamfilterISP mail was deliverd directly and there where no problems at all.

I removed the temporarly rerouting and everything works just fine.

I don't know how i could be so stupid to not think about that but i can't turn back time :)

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